#!/bin/bash
#
# Author: Raphael P. Ribeiro <raphaelpr01@gmail.com> 

uptime=$(</proc/uptime)
uptime=${uptime%%.*}

s=$(( uptime%60 ))
m=$(( uptime/60%60 ))
h=$(( uptime/60/60%24 ))
d=$(( uptime/60/60/24 ))

echo ""$d"d"$h"h"$m"m"